What is CVE-2026-86391?

CVE-2026-86391 is a medium-severity vulnerability in Dell Powerprotect Data Domain Management Center, classified under Authentication Bypass by Spoofing. CVSS score: 6.4/10. Published 2026-10-28.

How severe is CVE-2026-86391?

Medium severity. CVSS v3 base score is 6.4 out of 10.

Vulnerability in Dell Powerprotect Data Domain Management Center

CVE-2026-86391

Dell PowerProtect Data Domain Management Center, Feature Release versions 7.7.1.0 through 8.8, LTS2024 release versions 7.13.1.0 through 7.13.1.80, LTS2025 release versions 8.3.1.0 through 8.3.1.40, LTS2026 release versions 8.6.1.0 through 8.6.1.20, contain an Authentication Bypass by Spoofing vulnerability. A low privileged attacker with remote access could potentially exploit this vulnerability, leading to Denial of service.

Published 2026-10-28 · last modified 2026-10-29.

CVSS v3 metric

CVSS v3 base score 6.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:L.

EPSS exploit prediction

EPSS: 0.004 (31.6th percentile), scored 2026-10-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 32nd percentile — 31.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

The 30-day trend appears once there are two daily scores.

Affected products

Dell Powerprotect Data Domain Management Center

Weakness classification (CWE)

CWE-290 — Authentication Bypass by Spoofing

References

www.dell.com/support/kbdoc/en-us/000515178/dsa-2026-416-security-update-for-del… (vendor-advisory)

Frequently asked questions

What is CVE-2026-86391?: CVE-2026-86391 is a medium-severity vulnerability in Dell Powerprotect Data Domain Management Center, classified under Authentication Bypass by Spoofing. CVSS score: 6.4/10. Published 2026-10-28.
How severe is CVE-2026-86391?: Medium severity. CVSS v3 base score is 6.4 out of 10.